Great Adventure Pack Installing Issue

I bought the Great Adventure Pack. I can download the pack and download the individual games. However, when I try to install a game, it apparently can't open the files for writing. It gives me the options Abort/Retry/Ignore. I've tried uninstalling and redownloading the pack numerous times, but to no avail. What should I do?

There are several threads about this in the Game Support Forum, some of which offer working solutions.
The most common ones are running the program as administrator or running the installers themselves (once downloaded, they can be found under Telltale Games\Adventure Bundle inside your My Documents directory) as administrator.
Good luck!